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Ajax within UserControl loses next field value on postback

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Ajax

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Lenny_shp asked on 17 Sep 2009, 03:35 PM

2009.2.906.35 VS2008 SP1, XP, IE8.

I was able to isolate to minimally what is needed to reproduce the problem.

    
            <%@ Page Language="vb" AutoEventWireup="false" enableEventValidation="false" CodeBehind="Default.aspx.vb" Inherits="TestAjax._Default" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
        
            <html xmlns="http://www.w3.org/1999/xhtml" > 
        
            <head runat="server"> 
        
                <title>Test</title> 
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server"> 
        
                <telerik:RadScriptManager ID="ScriptManager1" runat="server" ScriptMode="Release"> 
        
                </telerik:RadScriptManager> 
        
                Use drop down, then put in value in first textbox, the focus will go to 2nd textbox but you cannot enter anything. 
        
            <br /> 
        
            If you click 2nd textbox again, type in, and also fill out 3rd textbox.  [Go], you'll see that the 2nd textbox value gets lost.          
        
            <br /> 
        
            If EnableAjax="false" then problem does not exist. 
        
            <br /> 
        
            <telerik:RadComboBox ID="cboFunction" EmptyMessage="Select a function" runat="server" AutoPostBack="true"> 
        
                                    <Items> 
        
                                        <telerik:RadComboBoxItem Text="" /> 
        
                                        <telerik:RadComboBoxItem Text="test1" Value="test1" /> 
        
                                    </Items> 
        
                                    <ExpandAnimation  Type="None" /> 
        
                                    <CollapseAnimation Type="None" /> 
        
                                </telerik:RadComboBox> 
        
            <br />                     
        
                            <asp:PlaceHolder ID="myPlaceHolder" runat="server"></asp:PlaceHolder> 
        
                        <asp:Button ID="btnGo" runat="server" Width="100px" Text="Go" Enabled="true" /> 
        
                        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" UpdatePanelsRenderMode="Inline" > 
        
                        <AjaxSettings>        
        
                            <telerik:AjaxSetting AjaxControlID="cboFunction"> 
        
                                <UpdatedControls> 
        
                                    <telerik:AjaxUpdatedControl ControlID="myPlaceHolder" /> 
        
                                </UpdatedControls>               
        
                            </telerik:AjaxSetting>                                                                        
        
                        </AjaxSettings> 
        
                    </telerik:RadAjaxManager> 
        
                </form> 
        
            </body> 
        
            </html>

    
            <%@ Control Language="vb" AutoEventWireup="false" CodeBehind="ucTest.ascx.vb" Inherits="TestAjax.ucTest" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <telerik:RadTextBox runat="server" ID="txtSubAccountNo" AutoPostBack="true" Width="450px"></telerik:RadTextBox> 
        
            <br /> 
        
            <telerik:RadTextBox runat="server" ID="txtSubAccountDesc" ReadOnly="true" BackColor="Gainsboro" TabIndex="-1" Width="450px"></telerik:RadTextBox> 
        
            <br /> 
        
            <telerik:RadTextBox runat="server" ID="txt2"  Width="450px"></telerik:RadTextBox> 
        
            <br /> 
        
            <telerik:RadTextBox runat="server" ID="txt3"  Width="450px"></telerik:RadTextBox> 
        
            <br />

8 Answers, 1 is accepted

answered on 17 Sep 2009, 07:30 PM

Another scenerio, when I placed the inner postback within AjaxUpdatePanel, I get a:
Microsoft JScript runtime error: Unkown runtime error

pointing to the line indicated by <<<<<<<<<<

    
            },_applySelection:function(){if(!this._isInVisibleContainer(this._textBoxElement)){return 
        
            }if((Sys.Browser.agent==Sys.Browser.Opera)||!document.selection){this._textBoxElement.selectionStart=this._selectionStart; 
        
            this._textBoxElement.selectionEnd=this._selectionEnd; 
        
            return 
        
            }this._textBoxElement.select(); <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 
        
            sel=document.selection.createRange(); 
        
            sel.collapse(); 
        
            sel.moveStart("character",this._selectionStart); 
        
            sel.collapse();

It seems to only work if I use both as AjaxUpdatePanel... using AjaxMgr would fail.

answered on 28 Sep 2009, 03:06 PM

    
                Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 
        
                    Dim myUserControl As UserControl 
        
                    myUserControl = DirectCast(LoadControl("~/ucTest.ascx"), UserControl) 
        
                    myUserControl.ID = "ucTest" '& CType(Int((Rnd() * 1024) + 1), String) 
        
                    myUserControl.EnableViewState = False 
        
                    myPlaceHolder.Controls.Add(myUserControl) 
        
                End Sub 
        
                Private Sub btnGo_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnGo.Click 
        
                    For Each cntrl As Control In myPlaceHolder.Controls(0).Controls 
        
                        If TypeOf (cntrl) Is RadTextBox Then 
        
                            Response.Write(DirectCast(cntrl, RadTextBox).Text & "<br>") 
        
                        End If 
        
                    Next 
        
                End Sub

There is only 1 unique control "ucTest" in this project. If I put RadAjaxPanel (id=ajax2) within the UserControl's UserControl, then it works fine. Somehow I could not product the Javascript error when combining it with AjaxMgr anymore.

    
            <%@ Control Language="vb" AutoEventWireup="false" CodeBehind="ucTest.ascx.vb" Inherits="TestAjax.ucTest" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <telerik:RadAjaxPanel runat="server" ID="ajax2"> 
        
                <telerik:RadTextBox runat="server" ID="txtSubAccountNo" AutoPostBack="true" Width="450px"> 
        
                </telerik:RadTextBox> 
        
                <br /> 
        
                <telerik:RadTextBox runat="server" ID="txtSubAccountDesc" ReadOnly="true" BackColor="Gainsboro" TabIndex="-1" Width="450px"> 
        
                </telerik:RadTextBox> 
        
            </telerik:RadAjaxPanel> 
        
            <br /> 
        
            <telerik:RadTextBox runat="server" ID="txt2"  Width="450px"></telerik:RadTextBox> 
        
            <br /> 
        
            <telerik:RadTextBox runat="server" ID="txt3"  Width="450px"></telerik:RadTextBox> 
        
            <br />

answered on 22 Feb 2012, 10:05 PM

Telerik-Error-2.gif

Hi,

We are having the same problem as described in the "http://www.telerik.com/community/forums/aspnet-ajax/ajax/ajax-within-usercontrol-loses-next-field-value-on-postback.aspx" dialog. The problem is only present under IE8, IE9 - both Chrome and FireFox a working fine with the code. I can recreate an error. If there was any solution found, please let us know.

Regards,

Mikhail Netsmekh